Parameter groups measured/observed/modelled

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Updated 2002-02-13

By launching several hundred ozonesondes and by ozone lidar
measurements at many Arctic and sub-Arctic stations, one of
them Ny-Ålesund, the stratospheric chemical ozone loss will be
determined. The launches of all stations will be coordinated by
analysis of trajectory calculations based on analysis and
forecast wind fields. The aim is to get as many ozone sounding
pairs as possible, each of them linked by trajectories in space
and time. A statistical description of the ozone differencies
given by the first and the second measurement of individual
sonde pairs will yield the chemical ozone loss with spatial and
time resolution.
Four similar campaigns took place in the Arctic and in the
mid-latitudes covering the time period of Januar to March in
each of the last four winters. In the first three winters high
ozone depletion rates (20 - 50 ppbv per day) were determined in
some height levels within the polar vortex. In the height level
of the ozone maximum an integrated ozone loss (during the
winter) in the order of 60 % have been found. These are record
ozone losses for the Arctic polar region. In the last winter the
ozone depletion rates had been much lower due to moderate
temperatures in the stratosphere.